Abstract
The neutron component of EAS has not been practically studied for many years. Creation of the neutron detector arrays PRISMA-32 and PRISMA-YBJ demonstrated the effectiveness of such investigations. It is important to underline that recording the EAS neutron component is carried out over the whole array area. Development of a new larger scale neutron detector array (URAN) in MEPhI will continue these studies. During the construction of the URAN array, a new design of en-detectors based on the scintillator with natural boron and new electronics was developed. The use of new electronics with a switchable sampling rate allows one to reach EAS fast timing accuracy up to 10 ns. The en-detectors of the URAN are located on the roofs of the buildings. The sensitive area of each detector is 0.36 m 2 , while the array's starting area is ∼ 10 3 m 2 . Total number of the initial array detectors is 72. They are subdivided into 6 independent clusters each of 12 en-detectors, connected with the central data acquisition station.
Highlights
The neutron component of EAS is produced in interactions of the hadronic component with atmospheric nuclei or substance close to the detector
Electronics for signal digitizing is installed in the Local Post (LP) of primary data processing which, like the detectors, is located on the building roof
The first EAS events registered during test runs are in good agreement with the data of other installations
Summary
The neutron component of EAS is produced in interactions of the hadronic component with atmospheric nuclei or substance close to the detector. The hadron component carries important information about the primary particle energy. Studying it is of a great interest. In 2014–2015 in MEPhI within the frameworks of the Program for support of the Russian Unique Scientific Facilities the first stage of a new URAN (Upstairs Registration of Atmospheric Neutrons) array [6] was created. It is aimed at the registration of thermal neutrons produced by the EAS hadronic component over the whole area of the array. Such location allows to decrease the influence of the building floor structure
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